/*
 *   可以通过 ... 展开一个数组
 * */

function fn(a, b, c) {
  return a + b + c;
}

const arr = [1, 2, 3];

// 计算数组中三个数字的和
let result = fn(...arr);
// console.log(result);

// const arr2 = [...arr]; // 相当于将arr浅复制给arr2
const arr2 = [7, 8, 9, ...arr, 4, 5, 6];

// console.log(arr2);

const obj = {
  name: "孙悟空",
  age: 18,
  gender: "男",
};

// const obj2 = {...obj}; // 将obj在新的对象中展开，相当于浅复制
const obj2 = { address: "花果山", ...obj, name: "猪八戒" };

console.log(obj2);
